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Full text of "Text Book Of Mechanical Engineering"

Appendix III.

921

steel plates

6 tons

iron plates     copper plates

4 tons        2 tons

Tensile stress^

steel rivets        iron rivets       copper rivets

Shear stress   fs   ...... 5 tons       3^ tons      ij tons

and deducing the formula for w" as :

/.

For steel plates and steel rivets:

w" = i *31 x ~r   = i '09 ins.
For iron plates and iron rivets :

w" = 1*31 x = rr.4 ins.

For steel plates and iron rivets:

iv"

1-31 x

3*5

76 in.

For copper plates and copper rivets:

yj" =  i'3 ix~   = '98 in.

P. 419. Strength of Hollow Shafts.

Example 66.A hollow steel shaft is to be designed so as to
tneet safely a twisting moment of 280 ton inches. The internal diameter
being 3 ins., find the external diameter :

D4^^4 __  16 T,n
D      ~~    /TT

D4-

-D

7 X22

= 81        or D4-2030-81

This equation may be put in the form

D4-203 D-8i  = y

and a curve may be constructed shewing y for various values of D,
the correct value of D being that corresponding to y = o.    Thus :

D  = 4

D   5

D  = 6

D  = 7

D  as   8

y
y
y
y

256-812-81
625-1015-81
1296-1218-81
2400-1421-81

4IOO-l624-8l

-637
-471
-3
+898

-I-2395